土钉支护基坑开挖的动态规划方法研究  

Study on Dynamic Programming of Soil-nailing Supported Foundation Pit Excavation

作　　者：曹净[1] 普琼香 刘海明[1] 李帅[1,2] CAO Jing;PU Qiong-xiang;LiU Hai-ming;Li Shuai(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China;Yurman Communications Investment and Construction Group Co.LTD.,Kunming 650000,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500 [2]云南省交通投资建设集团有限公司,昆明650000

出　　处：《控制工程》2018年第12期2120-2127,共8页Control Engineering of China

基　　金：国家自然科学基金青年项目(编号:51304088)

摘　　要：根据既有的土钉支护基坑设计方案,首先采用均匀试验确定土钉支护基坑开挖参数:然后采用FLAC^3D对每种开挖参数组合情况进行分层、分区、分段开挖的三维施工全过程模拟,计算出每组开挖参数对应的基坑坡顶位移,经对比得出最优的开挖方式;进而运用ACE非参数回归技术构建基坑开挖参数与最优开挖方式下的基坑坡顶位移的改进响应面关系;最后基于改进响应面关系,运用枚举法对基坑开挖参数进行优化,寻求开挖工期最短的施工方案。通过实例验证表明:该基坑开挖规划方法能实现快速、高效的优化求解,精度较高,为基坑开挖动态规划提供了一种新思路。According to the soil-nailing supported foundation pit design scheme, the Uniform tables of foundation pit excavation parameters are established by uniform design(UD). In addition, FLAC3 D is used to establish the dynamic simulation model of excavation parameters in each group. The optimal excavation method is obtained by comparison. Meanwhile, the modified response surface between the foundation pit excavation parameters and the foundation pit slope displacement of the optimal excavation method, was built by the ACE nonparametric regression technique. Finally, based on the modified response surface, the foundation pit excavation parameters are optimized by the enumeration method. The dynamic programming model for the foundation pit excavation which based on the modified response surface method and the enumeration method is applied to Bijimingcheng foundation pit engineering excavation dynamic programming in Kunming. The results show that the optimization method is time-saving and high efficiency algorithm, which provides a new idea for dynamic Programming of foundation pit excavation.

关 键 词：土钉支护基坑 开挖规划 动态模拟 均匀试验 ACE非参数回归技术 

分 类 号：TU463[建筑科学—结构工程]